Oracle VirtualBox VMSVGA Numeric Truncation Information Disclosure Vulnerability

April 22nd, 2021
ZDI-21-451 ZDI-CAN-13464

CVE ID

CVE-2021-2266

CVSS Score

6.0 AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N

Affected Vendors

Oracle

Affected Products

VirtualBox

Vulnerability Details

This vulnerability allows local attackers to disclose sensitive information on affected installations of Oracle VirtualBox. An attacker must first obtain the ability to execute high-privileged code on the target guest system in order to exploit this vulnerability.

The specific flaw exists within the VMSVGA virtual device. The issue results from an integer truncation before reading from memory. An attacker can leverage this in conjunction with other vulnerabilities to escalate privileges and execute arbitrary code in the context of the hypervisor.

Additional Details

Oracle has issued an update to correct this vulnerability. More details can be found at:
https://www.oracle.com/security-alerts/cpuapr2021.html

Disclosure Timeline

  • 2021-04-14 - Vulnerability reported to vendor
  • 2021-04-22 - Coordinated public release of advisory

Credit

JunYoung Park (@candymate) of VirtualBoBs

Back to Advisories